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THE SKELETON AND TEETH              111)
Remains of Man in the British Museum " (Natural History).
When viewed from above the skull presents an oval outline. The profile is eharacteiized by a flattened vertex rising to a variable, but never great, height above the well-marked supra-orbital crests. The face is sometimes sirnognafchic, but never to such a degree as in the Orang.
In a young skull the temporal ridges run horizontally backwards from the external angular processes of the frontal bone. In adult animals they converge and rnn together along the vertex, diverging later to pass round to the caudal end of the zygoma. Owen (374) figures a skull where thev meet in the mid-line of the head. The
coronal,  sagittal  and  lambdoid  sutures  rnav  be   verv
'              O                                                                                                                                 tf                                     v
tortuous, and Wormian bones may lie along the latter. In the small animal whose skull is shown in fig. A, there is a large triangular bone in the lambda, and several small ones in the lambdoid suture.
Norma   Frontalis,  The   supra - orbital   crests,
which are well marked, are thrown into prominence by the flattening of the vertex. They meet across the nose as in the Gorilla, whereas they are discontinuous in the Asiatic Simiidse. Laterally they meet the prominent external angular processes of the frontal bones. As age advances they increase in size, and the orifice or notch, through which the supra-orbital vessels and nerve pass, becomes better marked.
The orbital apertures are quadrangular, with rounded angles as in the Gorilla; and the transverse diameter exceeds the vertical. The walls are complete, and the foramen rotundum may be seen in some skulls at the